body {
  .demo {
    width: 100px;
    height: 100px;
    border: 1px solid green;
    background-image: url(../images/1.jpg);
    background-size: contain;
  }
  .demo2 {
    width: 100px;
    height: 100px;
    border: 1px solid red;
    background-image: url(../images/3.png);
  }
}

#people{
  transform: scale(0.5);
}
